How do you disperse pigments?
Pigment dispersion can be divided into three overlapping steps:
- Wetting—for good wetting, the dispersant must have a lower surface tension than that of the pigment.
- Deagglomeration—the wetted clumps are sheared by a blade, roller, sand, or beads, which break the pigment into smaller agglomerates or primary particles.
Which is used in pigment grinding?
The most widely used surfactants for pigment dispersion in coating formulations are: Fatty acid derivatives. Phosphate esters. Sodium polyacrylates / polyacrylic acid.
What are pigment dispersions used for?
They can contain water, solvent, or based on a resin that is liquid at room temperature. Pigment dispersions often have relatively high pigment concentrations and are used in additive quantities to impart color in a wide variety of products.
What is an example of a dispersing agent?
The definition of a dispersing agent is a chemical that is added to an oil, cement or another liquid to prevent it from hardening or clumping. An example of a dispersing agent is the ingredient added to gasoline to keep it from leaving behind a sticky residue.
What is pigment agglomeration?
Agglomerates represent pigment “groupings” in which the spaces between the individual pigment particles contain air and moisture. These individual pigment particles are in contact with one another only along their edges and corners.
How do you check for pigment dispersion?
Pigment dispersion quality in pastes and paints may be tested by one of several different techniques. Probably the most common method in labs and plants is taking readings with a grind gauge, usually the Hegman type (ASTM D1210).
What is water-based pigment?
Water-based pigment dispersions are used instead of dyes in applications which require opacity, light stability and/or thermal stability. Pigments are particles and are generally more opaque than dyes, although some of our dispersions can be manufactured to be transparent.
What is pigment grinding?
Pigment grinding is the essential step that allows powdered pigments to be transformed into smooth, liquid paint. The process is in itself an art form that receives little attention, even in the world of artists’ supplies.
What is a Biodispersant?
Description. Accepta 2321 is a high-performance cooling water dispersant that incorporates powerful surface active agents. It is scientifically formulated for the treatment of cooling systems including re-circulating and once-through cooling water systems.
What is dispersing agent in textile?
Dispersing agents are used in the manufacture and application of these dyes. Such agents are also used for maintaining in a dispersed state other insoluble substances used in textile finishing processes such as scouring and cleansing.
What is water based pigment?
Is water based pigment waterproof?
It is possible to have some degree of water resistance even if it is aqueous, though not as oily. The secret lies in the pigment, and it can be said that the pigment is more water resistant than the dye.
Which is the best dispersion agent for pigment concentrates?
Modified Fatty Acid type – Acting like emulsifier, they are giving excellent results for universal pigment concentrates. Phosphoric Acid Ester – Polyether and polyester structure, excellent for inorganic material dispersion. in your formulations! for Titanium Dioxide… Chemical structure (polyacrylic, polyurethane, copolymer…), and
How does the dispersion of pigments take place?
Formulators are using pigments in order to bring desired color in the paint. But keeping these solid particles stable in a liquid is a complex mechanism which includes appropriate: wetting, dispersing and stabilizing of solid particles in the system. How Does Pigment Dispersion Takes Place? The dispersion process is crucial.
Can you mix wetting and dispersing agents without pigments?
Mix the wetting & dispersing agent with the system, without pigments. It should be perfectly compatible with the other formulation component. If not, try adjusting the pH or the polarity. After the dispersion, make a simple poor-out of a small amount of paint diluted (10-20% in solvent or water).
What are the dispersing agents of Munzing Chemie?
From the range of polymeric dispersing agents of MÜNZING CHEMIE GMBH: Dosage in pigment pastes 0.5 – 10 % inorganic pigments 5 – 30 % organic pigments 20 – 60 % carbon black in direct grinding 0.5 – 10 % inorganic pigments 5 – 30 % organic pigments as compatibility agent approx.
